Safety bridge-gate



(ModL) A. HUNT. Safety Bridge-Gate.

Attorneys.

Patented June 8, I880.

' ILPEIERS PHOTO-LIDIOGflAPIIER. WASHINGTON. I16.

UNITED STATES ATENT OFFI E.

ADAM HUNT, OF CLEVELAND, OHIO.

SAFETY BRI DGE-GATE.

SPECIFICATION forming part of Letters Patent N0. 228,640, dated. June 8, 1880.

Application filed March 9, 1880. (ModeL) To all whom it may concern:

- Be it known that I, ADAM HUNT, of Cleveland, in the county of Ouyahoga and State of Ohio, have invented a new and useful Improvement in Safety Bridge-Gates; and I do hereby declare that the following is a full and exact description of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

My invention relates to certain improvements in gates for draw-br1dges, designed es pecially for the common form of swing or pivot bridge, the object being. to furnish a device at once strong and simple in construction, which will automatically open and close as the bridge is closed or opened, so that when the bridge is swung to allow the passage of a vessel the roadway will be closed to passing vehicles and pedestrians, and accidents from carelessly neglected safety gates prevented, as it will be impossible to open the draw without closing the gates, and they cannot be opened again'until the bridge is completely closed. I have accomplished this end by means of very simple and comparatively inexpensive mechanism, and that which is fully as efi'ective as much more complicated devices would be.

In the drawings, Figure 1 is a perspective view of a portion of a draw-bridge, showing my improved gate. Fig. 2 is a plan of the operating mechanism 5 and Fig. 3 is the guide attached to each end of the swinging bridge, to engage and operate the opening and closing mechanism of the gate.

In Fig. 1, A is a portion of the draw or swing bridge. a is a guide attached to the vends of the bridge, provided with two arms,

as shown in Fig. 3, and having anti-friction rollers a a. These engage the cam B, and as the bridge revolves the curved guide or cam B, which is attached to the bed-plate G, sliding in grooved ways 0, is caused to be moved inwardly or outwardly according to the movement of the draw, and by moving the pins D within the guides D a revolving motion is given to the bases of the posts E,

'thus moving the gates around, causing them to gradually close as the bridge opens and open in direct opposition as it closes. Thus the bridge can never-be open when the gates with the closing of the bridge.

The parts may be made of wood and iron or other suitable material, and being simple in their construction and arrangement, are not liable to get out of order.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination, with a sliding plate or frame and mechanism for rotating one or more gate-posts, of a double-faced cam attached to said sliding plate or frame and arms attached to the bridge, said arms being arranged to engage the opposite sides of said cam and open the gate or gates when the bridge is closed and close the gate or gates when the bridge is opened, substantially as described.

2. In a safety bridge-gate, the combination, with a vertical rotary gate-post provided with an arm and a horizontal sliding plate having stud-an'd-slot engagement with the latter, of two arms, which depend from the bridge and embrace a transverse cam formed on the sliding plate, substantially as set forth.

3. In a safety bridge-gate, the combination, with a vertical rotary gate-post provided with a slotted arm and a horizontal slidingplate provided with an upright stud fitting in the slot: ted arm, of two arms depending from the bridge and provided with friction rollers which embrace a transverse cam formed on .provided with a horizontal slotted arm, and

an upright stud formed on the plate and fit.- ting in said slotted arm, substantially as set forth.

This specification signed and witnessed this 28th day of August, 1879.

ADAM HUNT,

Witnesses:

DR. J. V. EsoH, Geo. U. TRACY.

are closed, and, vice versa, the gates open 

